Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29b94a215f420ba…

MALICIOUS

PDF

85.8 KB Created: 2021-07-13 19:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c69839994cb0c2517c3592f94d47a71b SHA-1: 8e668e9e59c4578cbfcf62862ab04463e03afda9 SHA-256: a29b94a215f420bac981103e259eed38d1950c200119df592bef4a20f0e3d223
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. This suggests a phishing or SEO manipulation attack pattern, aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dichvuketoanvn.org/uploads/files/70683673562.pdf In PDF document text
    • https://cortopolis.ar/userfiles/file/85968898299.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/be0f1821a17f6fc35faa6f018fa9d8da/45883939648.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/26111966862.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/90446119752.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090548b4d6d8---44519141826.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/jaxuxutuwawexiwab.pdfIn PDF document text
    • https://topupdana.com/contents//files/zelekiwepovimutefasa.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b27802f584dcfc3ded1892cc166b3b80/gakigawugajatak.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/foxazumaregefurunasuzo.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/ad0214c2653cd53ec507fb443a83ba40/97254700186.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/74922960059.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/sakokuzejaxitawofozup.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/lufera.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f55308273c---xafomatajujuguzuvuwuba.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/5318327059.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/01eefa754c27befe526d41e7745ae780/wawipuniwiwipotekibubazap.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/wufamafepiguxoladeruf.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/xamisedamibizidu.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/tikoveviz.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/wixuvumilovevejuzekal.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/sulotolizejalodoz.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607d20beaa73f---sekalelazifaf.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/51775611530.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/wipoba.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a00e8be49975a13af322636564acece2/pofepepopebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=passive+voice+turn+these+sentences+into+the+passive+resueltoPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D9 25512 bytes
SHA-256: 8e6b8e0bcba65024e57849a226d1abeeb0f7e7c83246537c42e06c937f816735
font_01_sfnt_off000116fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F11 10636 bytes
SHA-256: ae71c51dadea5fce5b9722df5150e327b3e6eeaceaefef5a682b5a8c089c3ace

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